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http://dx.doi.org/10.12656/jksht.2017.30.5.207

Failure Behavior of Piercing Plug during Seamless Tube Manufacturing Process  

Lim, Young-Bin (Graduate School of Metallurgical Engineering, Division of Advanced Materials Engineering, Chonbuk National University)
Yoon, Jeong-Mo (Graduate School of Metallurgical Engineering, Division of Advanced Materials Engineering, Chonbuk National University)
Publication Information
Journal of the Korean Society for Heat Treatment / v.30, no.5, 2017 , pp. 207-214 More about this Journal
Abstract
In this study, failure behavior of piercing plug for seamless tube manufacturing process was studied. Three different kinds of passed piercing plugs (10, 90, 215 times) were prepared. The shape deformation of the passed piercing plugs was observed by 3D coordinate measuring machine, and the oxidized layer on the surface of piercing plug was observed by optical microscopy. The length reduction of piercing plug presented at 215 times passed plug. It was found that the oxidized layer consisted of outer scale, inner scale and internal oxidation layers, and the inner scale layer had vertical cracks, and interfaces had horizontal cracks. We proposed the failure mechanism of piercing plug during seamless tube manufacturing process based on the formation of vertical and horizontal crack.
Keywords
Seamless tube; Piercing plug; Piercing pass; Iron oxide layer; Failure behavior;
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